原理
ip和掩码做与计算。如果结果相同，则证明两个ip在同一个网段
代码如下
#!/bin/bashIPPattern='^(\<([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\>\.){3}\<([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\>$'function check_ip_valide(){IP="$1"for special_ip in ${special_ips[@]}dolocal ret=$(echo $IP | grep ${special_ip})if [ -n "$ret" ];thenreturn 1fidoneif [[ "${IP}" =~ ${IPPattern} ]]; thenreturn 0elsereturn 1fi}function calc_ip_net(){sip="$1"snetmask="$2"check_ip_valide "$sip"if [ $? -ne 0 ];then echo "";return 1;filocal ipFIELD1=$(echo "$sip" |cut -d. -f1)local ipFIELD2=$(echo "$sip" |cut -d. -f2)local ipFIELD3=$(echo "$sip" |cut -d. -f3)local ipFIELD4=$(echo "$sip" |cut -d. -f4)local netmaskFIELD1=$(echo "$snetmask" |cut -d. -f1)local netmaskFIELD2=$(echo "$snetmask" |cut -d. -f2)local netmaskFIELD3=$(echo "$snetmask" |cut -d. -f3)local netmaskFIELD4=$(echo "$snetmask" |cut -d. -f4)local tmpret1=$[$ipFIELD1&$netmaskFIELD1]local tmpret2=$[$ipFIELD2&$netmaskFIELD2]local tmpret3=$[$ipFIELD3&$netmaskFIELD3]local tmpret4=$[$ipFIELD4&$netmaskFIELD4]echo "$tmpret1.$tmpret2.$tmpret3.$tmpret4"} tmpip1=$(calc_ip_net "$1" "$3")tmpip2=$(calc_ip_net "$2" "$3")if [ "$tmpip1" != "$tmpip2" ];thenecho "no"elseecho "same"fi
